锕
锕是一种放射性金属元素，符号为Ac，原子序为89。锕拉1899年被发现，是首个得到分离个非原始核素（non-primordial radioactive element）。虽然钋、镭搭氡比锕更早被发现，但是科学家到1902年才分离出箇些元素。拉元素周期表中，锕系元素始于锕，止于铹，一共有15种元素。
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